TEST HAS BEEN DELAYED!!!

I will now have at least 41 days clean before I have to test so I'm feeling pretty good.
Home tests have not arrived yet.
About 16 days clean now... really want a bonghit. The job is worth it though. Slightly glamorous and a lot of fun. Plus my husband would be PISSED!
Question:
Why do people take all the asprin, b-2, tums and sports drinks when "practicing" for the actual dillution? Wouldn't a good practice run just involve the fluid intake as home tests do not check for integrity? Or do they?...control line?...no...that can't be possible.
Kinda like practicing subbing with just water not the real stuff?